megaco_transport(3erl)					     Erlang Module Definition					    megaco_transport(3erl)

NAME

       megaco_transport - Megaco transport behaviour.

DESCRIPTION

       The following functions should be exported from a megaco_transport callback module:

	 * send_message/2 [ mandatory ]

	 * send_message/3 [ optional ]

	 * resend_message/2 [ optional ]

	 *

EXPORTS

       Module:send_message(Handle, Msg) -> ok | {cancel, Reason} | Error
       Module:send_message(Handle, Msg, Resend) -> ok | {cancel, Reason} | Error

	      Types  Handle = term()
		     Msg = binary() | iolist()
		     Resend = boolean()
		     Reason = term()
		     Error = term()

	      Send a megaco message.

	      If the function returns {cancel, Reason} , this means the transport module decided not to send the message. This is not an error. No
	      error messages will be issued and no error counters incremented. What actions this will result in depends on what  kind  of  message
	      was sent.

	      In  the  case of requests, megaco will cancel the message in much the same way as if megaco:cancel had been called (after a success-
	      full send). The information will be propagated back to the user differently depending  on  how  the  request(s)  where  issued:  For
	      requests	issued	using megaco:call , the info will be delivered in the return value. For requests issued using megaco:cast the info
	      will be delivered via a call to the callback function handle_trans_reply .

	      In the case of reply, megaco will cancel the reply and information of this will be returned to the user via a call to  the  callback
	      function handle_trans_ack .

	      The  function  send_message/3  will only be called if the resend_indication config option has been set to the value flag . The third
	      argument, Resend then indicates if the message send is a resend or not.

       Module:resend_message(Handle, Msg) -> ok | {cancel, Reason} | Error

	      Types  Handle = term()
		     Msg = binary() | iolist()
		     Reason = term()
		     Error = term()

	      Re-send a megaco message.

	      Note that this function will only be called if the user has set the resend_indication config option to true and it is in fact a mes-
	      sage resend. If not both of these condition's are meet, send_message will be called.

	      If the function returns {cancel, Reason} , this means the transport module decided not to send the message. This is not an error. No
	      error messages will be issued and no error counters incremented. What actions this will result in depends on what  kind  of  message
	      was sent.

	      In  the  case of requests, megaco will cancel the message in much the same way as if megaco:cancel had been called (after a success-
	      full send). The information will be propagated back to the user differently depending  on  how  the  request(s)  where  issued:  For
	      requests	issued	using megaco:call , the info will be delivered in the return value. For requests issued using megaco:cast the info
	      will be delivered via a call to the callback function handle_trans_reply .

	      In the case of reply, megaco will cancel the reply and information of this will be returned to the user via a call to  the  callback
	      function handle_trans_ack .

Ericsson AB							   megaco 3.15.1					    megaco_transport(3erl)